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<?php class PromoteConstructorProperty { public function __construct( public string $var ) { } } $bool = class_exists(PromoteConstructorProperty);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Error: Undefined constant "PromoteConstructorProperty" in /in/oEW4q:11 Stack trace: #0 {main} thrown in /in/oEW4q on line 11
Process exited with code 255.

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